All mobile phones must        during the meeting.
A、turn off                 B、are turned               C、be turned off
C

試題分析：句意：在會(huì)議期間所有的電話必須都關(guān)上。turn off   關(guān)上，本句主語All mobile phones是動(dòng)作turn off   的承受者，所以要用被動(dòng)語態(tài)，而且是情態(tài)動(dòng)詞的被動(dòng)語態(tài)，情態(tài)動(dòng)詞+be+動(dòng)詞的過去分詞，故選C。
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